Q.

Boron has two stable isotopes, 10B19% & 11B81%  . Average atomic weight for boron in the periodic table is

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a

10.8

b

10.2

c

11.2

d

10.0

answer is A.

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Detailed Solution

Average atomic mass=R.A(1)×M.No+R.A.(2)×M.NoR.A.(1)+R.A.(2)Where R.A = relative abundance M.No = Mass number=19×10+81×11100=10.81
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